{ "id": "epbjjbgrh7", "slug": "electrofusion", "title": "Electrofusion", "updated": "2026-10-25", "topic_path": [ { "id": "life", "label": "Life and health", "api_url": "https://www.edgepedia.org/api/v1/topics/life" }, { "id": "life.biology", "label": "Biological foundations", "api_url": "https://www.edgepedia.org/api/v1/topics/life.biology" }, { "id": "life.biology.cells", "label": "Cell biology", "api_url": "https://www.edgepedia.org/api/v1/topics/life.biology.cells" }, { "id": "life.biology.cells.membranes_and_trafficking", "label": "Membranes and trafficking", "api_url": "https://www.edgepedia.org/api/v1/topics/life.biology.cells.membranes_and_trafficking" } ], "geo": [ { "id": "geo.nongeo.t1946.life.biology.cells", "label": "Non-geographic · 1946 to 2000: Cell biology", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.life.biology.cells", "path": [ { "id": "geo.nongeo", "label": "Non-geographic", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo" }, { "id": "geo.nongeo.t1946", "label": "Non-geographic · 1946 to 2000", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946" }, { "id": "geo.nongeo.t1946.life", "label": "Life and health", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.life" }, { "id": "geo.nongeo.t1946.life.biology", "label": "Biological foundations", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.life.biology" }, { "id": "geo.nongeo.t1946.life.biology.cells", "label": "Cell biology", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.life.biology.cells" } ] } ], "excerpt": "Electrofusion is a bench technique using short electric pulses to fuse adjacent cell membranes, producing hybrid cells for monoclonal antibodies, cancer vaccines, and diabetes research.", "snippet": "Electrofusion is a bench technique using short electric pulses to fuse adjacent cell membranes, producing hybrid cells for monoclonal antibodies, cancer vaccines, and diabetes research.", "node": "life.biology.cells.membranes_and_trafficking", "markdown": "# Electrofusion\n\nElectrofusion is a bench biology technique that uses short, intense electric pulses to fuse the membranes of adjacent cells, producing hybrid cells such as hybridomas and somatic cell hybrids. Its first and best-known application is the production of monoclonal antibodies, and it is also used for [cancer vaccines](https://www.edgepedia.org/cancer-vaccine), diabetes research, and regeneration of central nervous system axons.[1](https://www.nature.com/articles/srep03382) Electrofusion has been used in membrane research and somatic hybridization.[2](https://link.springer.com/chapter/10.1007/978-1-4612-4826-2_5)\n\n| Key fact | Detail |\n|---|---|\n| Product | Hybrid cells: hybridomas, somatic cell hybrids, reprogrammed fused pairs[1](https://www.nature.com/articles/srep03382) |\n| Mechanism | AC dielectrophoretic alignment, then DC pulse-induced reversible membrane breakdown[3](https://pmc.ncbi.nlm.nih.gov/articles/PMC11026109/) |\n| Typical DC pulses | 1–10 kV/cm, 10–50 µs (microfluidic); 300 V, 80 µs ×4 (pellet)[3](https://pmc.ncbi.nlm.nih.gov/articles/PMC11026109/) • [4](https://www.cell.com/biophysj/fulltext/S0006-3495%2896%2979249-4) |\n| AC alignment | 1–3 MHz at 100–300 V/cm (chip scale); 50 V for 50 s (bench protocol)[3](https://pmc.ncbi.nlm.nih.gov/articles/PMC11026109/) • [5](https://cshprotocols.cshlp.org/content/2019/10/pdb.prot103184.full) |\n| Reported yields | ~80–95% fusion in pellets; 65% chip fusion at 95% viability; 173 ± 70 hybridoma clones per trial[4](https://www.cell.com/biophysj/fulltext/S0006-3495%2896%2979249-4) • [6](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0131966) |\n| Advantage over PEG | 3.8–33× more hybridomas per spleen cell in one direct comparison; manufacturer claims up to 80-fold[7](https://doi.org/10.1089/hyb.1988.7.627) • [8](https://btxonline.com/media/wysiwyg/posters_page/Electrofusion_vs_PEG.pdf) |\n\n## How it works\n\nElectrofusion is a two-condition process: close physical contact between cells must be established, and the cell membranes must be brought into a fusogenic state. Dielectrophoresis, the movement of polarized cells in a nonuniform alternating field, is the most widely used way to achieve contact.[1](https://www.nature.com/articles/srep03382) The AC field induces a dipole within each cell; as cells move toward a common point the dipoles attract, and pearl-chain formation results.[8](https://btxonline.com/media/wysiwyg/posters_page/Electrofusion_vs_PEG.pdf)\n\nOnce cells touch, a brief but intense DC field forms temporary pathways, or pores, in the cell membrane.[8](https://btxonline.com/media/wysiwyg/posters_page/Electrofusion_vs_PEG.pdf) The DC pulse transiently makes reversible pores in the cytoplasmic membranes to initiate fusion of adjacent cytoplasmic membranes, and the adjacent membranes subsequently fuse in a multistep process after the pulse.[9](https://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC7122683&blobtype=pdf) • [22](https://www.mpikg.mpg.de/th/people/dimova/publications/Riske%20BRL%2006.pdf) The process completes with rounding off of the fused cells.[5](https://cshprotocols.cshlp.org/content/2019/10/pdb.prot103184.full) In a homogeneous field, the dielectrophoretically collected cells provide their own field-inhomogenizing influence, so fusion can proceed even in chambers without strong field gradients.[10](https://onlinelibrary.wiley.com/doi/10.1002/abio.370060321)\n\n## How it is done\n\nA representative hybridoma protocol proceeds as follows. Cells are prepared in low-conductivity electro cell fusion (ECF) buffer, with 2 mL of cell suspension at \\( 4 \\times 10^{6} \\) cells added to the fusion chamber kept on ice.[5](https://cshprotocols.cshlp.org/content/2019/10/pdb.prot103184.full) An AC alignment stage follows: 50 V for 50 s of dielectrophoretic alignment, then a DC pulse of 3000 V (one pulse), then postfusion AC for 3 s to hold cells together during rounding off.[5](https://cshprotocols.cshlp.org/content/2019/10/pdb.prot103184.full) On microfluidic chips the same logic uses a high-frequency (1–3 MHz), low-intensity (100–300 V/cm) AC field for alignment, followed by a series of high-intensity (1–10 kV/cm), short-duration (10–50 µs) pulses that induce reversible electroporation.[3](https://pmc.ncbi.nlm.nih.gov/articles/PMC11026109/)\n\nAfter pulsing, cells are incubated for 30 min at 37 °C in postfusion medium, then plated in selection medium, with viability checked after 7 days.[5](https://cshprotocols.cshlp.org/content/2019/10/pdb.prot103184.full) In bulk fusions, applying pulses in two directions perpendicular to each other was the most successful configuration in both B16F1 and CHOK1 cell lines tested.[11](https://pubmed.ncbi.nlm.nih.gov/18667367/)\n\n## Origin\n\nThe principle was stated by Ulrich Zimmermann and colleagues in 1981 in Angewandte Chemie International Edition in English: electrical breakdown in the zone of contact between membranes of cells made to adhere by weak inhomogeneous alternating fields leads to fusion into a single cell with new functions.[12](https://doi.org/10.1002/anie.198103251) Human hybridoma cells produced by electro-fusion were reported by R. Bischoff and colleagues in FEBS Letters in 1982.[13](https://doi.org/10.1016/0014-5793%2882%2981012-0) A review in Biochimica et Biophysica Acta on electrical breakdown-mediated membrane effects is cited as an early foundation.[14](https://doi.org/10.1038/333579a0) Electromanipulation had long been used to form pores in cell membranes to transfect them with foreign DNA; the technique was later extended to the preparation of hybridomas, as noted in a 1988 Nature commentary by M. Glassy.[14](https://doi.org/10.1038/333579a0) An improved electrofusion technique for mouse hybridoma cells was published in FEBS Letters, and the same year hybridoma clones were generated by electrofusion in a batch-type manner applicable to any type of antigen.[2](https://link.springer.com/chapter/10.1007/978-1-4612-4826-2_5)\n\n## Variants\n\nSeveral chamber and pulse formats are documented. Bulk fusion can be run in a homogeneous electric field[10](https://onlinelibrary.wiley.com/doi/10.1002/abio.370060321) or in a centrifuged pellet, where membrane breakdown occurs at a lower applied voltage than in suspension because pulse voltage redistributes as breakdown lowers pellet resistance.[4](https://www.cell.com/biophysj/fulltext/S0006-3495%2896%2979249-4) Microelectrode and micro-cavity chips constrict the field to reduce working voltage and [Joule heating](https://www.edgepedia.org/joule-heating), and reduce multi-cell fusion.[6](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0131966) Nanosecond-pulse protocols exist, and combining nanosecond with microsecond pulses substantially improved hybridoma electrofusion efficiency.[1](https://www.nature.com/articles/srep03382) • [15](https://www.mdpi.com/2306-5354/9/9/450) In droplet microfluidics, two HL60 cells have been electrofused inside a picoliter microdroplet, an intermediate step toward controlled hybridoma formation.[16](https://www.nature.com/articles/s41598-018-21993-8) Electrofusion is also applied to somatic cell nuclear transfer, where fusion conditions such as electrode shape and mannitol concentration affect efficiency.[17](https://www.slarc.org.cn/dwyx/EN/Y2009/V29/I6/366) In 2024, Yaqi Bai and colleagues described in Analytical Chemistry a microfluidic chip for cell fusion with in situ separation of fused cells.[18](https://doi.org/10.1021/acs.analchem.4c04633)\n\n## Applications\n\nThe dominant application is hybridoma production for monoclonal antibodies, including mouse hybridomas and human-mouse heterohybridomas made by modified Köhler and Milstein technology.[1](https://www.nature.com/articles/srep03382) • [11](https://pubmed.ncbi.nlm.nih.gov/18667367/) A micro-cavity chip has fused NIH3T3 cells with mouse embryonic stem cells to induce somatic cell reprogramming, with fused cells demethylating gradually during reprogramming.[6](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0131966) Artificially induced fusion is used to investigate and treat diseases such as diabetes and to produce cells for cancer immunotherapy vaccines.[1](https://www.nature.com/articles/srep03382) In 2024, gene electrotransfer and cell electrofusion were combined in a single-step workflow to generate activated cancer cell vaccines.[19](https://link.springer.com/article/10.1007/s00232-024-00320-5) In nuclear transfer, donor cells fused with oocytes by electrofusion, with PEG/DMSO pretreatment raising the fusion rate from 25.64% to 51.11%.[17](https://www.slarc.org.cn/dwyx/EN/Y2009/V29/I6/366)\n\n## Limitations and alternatives\n\nQuantitative yields vary by format. Pellet fusion of CHO or L1210 cells with erythrocyte ghosts using four rectangular pulses of 300 V and 80 µs gave approximately 80% fusion by content-mixing assay and approximately 95% by membrane-dye-mixing assay, with viability above 80%.[4](https://www.cell.com/biophysj/fulltext/S0006-3495%2896%2979249-4) The micro-cavity chip paired 42% of cavities and electrofused 65% of paired cells at 95% viability.[6](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0131966) Droplet platforms reach only about 5% fusion yield (six pulses of 2–3 V, membrane field about 1 MV/cm for 1 ms), though at up to 500 cells per second;[16](https://www.nature.com/articles/s41598-018-21993-8) a continuous-flow droplet approach achieved 8% fusion at 0.4 cells/s.[20](https://kyushu-u.elsevierpure.com/en/publications/spatially-constrained-encapsulation-of-cells-in-microdroplets-ena/)\n\nFailure modes are well characterized. Fused cells lose viability and dye retention within 30 min in serum-free phosphate-buffered saline, but remain viable for 3 h in serum-containing medium at 37 °C.[4](https://www.cell.com/biophysj/fulltext/S0006-3495%2896%2979249-4) Ten pulses of 500 µs were probably too strong for myeloma cells to survive, and 400 V amplitudes were suboptimal for making lymphocytes fusogenic.[11](https://pubmed.ncbi.nlm.nih.gov/18667367/) Buffer osmotic pressure influences microfluidic fusion outcome and is a controllable parameter.[3](https://pmc.ncbi.nlm.nih.gov/articles/PMC11026109/)\n\nAgainst polyethylene glycol (PEG) fusion, a direct comparison found electrofusion yielded 3.8 to 33.0 times more hybridomas per unit number of spleen cells, with hybridomas growing more vigorously and visible earlier. A manufacturer poster claims hybrid yields up to 80-fold over PEG.[8](https://btxonline.com/media/wysiwyg/posters_page/Electrofusion_vs_PEG.pdf) PEG fusion suffers from peroxide and aldehyde build-up and depends on variables such as pellet size, shape, and stirring method.[8](https://btxonline.com/media/wysiwyg/posters_page/Electrofusion_vs_PEG.pdf) In one heterohybridoma study, electrofusion results were comparable to PEG-mediated fusion on the same cell type.[11](https://pubmed.ncbi.nlm.nih.gov/18667367/) In a microfluidic pairing device, electrofusion was significantly more efficient than PEG (P < 0.05), with 78% fluorescence exchange between labeled pairs.[21](https://pmc.ncbi.nlm.nih.gov/articles/PMC3251011/)\n\n## References\n\n1. [Cell electrofusion using nanosecond electric pulses (Scientific Reports)](https://www.nature.com/articles/srep03382)\n2. [Electrofusion of Cells (book chapter, Springer)](https://link.springer.com/chapter/10.1007/978-1-4612-4826-2_5)\n3. [Mechanism study on the influences of buffer osmotic pressure on microfluidic chip-based cell electrofusion (2024)](https://pmc.ncbi.nlm.nih.gov/articles/PMC11026109/)\n4. [S0006 3495(96)79249 4 (cell.com)](https://www.cell.com/biophysj/fulltext/S0006-3495%2896%2979249-4)\n5. [Electro Cell Fusion for Hybridoma Production (Cold Spring Harbor Protocols)](https://cshprotocols.cshlp.org/content/2019/10/pdb.prot103184.full)\n6. [A Cell Electrofusion Chip for Somatic Cells Reprogramming (PLOS One, 2015)](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0131966)\n7. [Direct Comparison of Electric Field-Mediated and PEG-Mediated Cell Fusion for the Generation of Antibody Producing Hybridomas](https://doi.org/10.1089/hyb.1988.7.627)\n8. [Electrofusion vs PEG (BTX/Harvard Apparatus technical poster)](https://btxonline.com/media/wysiwyg/posters_page/Electrofusion_vs_PEG.pdf)\n9. [Electrofusion mechanism (PMC full text)](https://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC7122683&blobtype=pdf)\n10. [Hybridoma cells produced by electrofusion in a homogeneous electric field (Analytical Biochemistry)](https://onlinelibrary.wiley.com/doi/10.1002/abio.370060321)\n11. [Optimization of bulk cell electrofusion in vitro for production of human-mouse heterohybridoma cells](https://pubmed.ncbi.nlm.nih.gov/18667367/)\n12. [Ulrich Zimmermann and colleagues (1981). Cells with Manipulated Functions: New Perspectives for Cell Biology, Medicine, and Technology. Angewandte Chemie International Edition in English.](https://doi.org/10.1002/anie.198103251)\n13. [Human hybridoma cells produced by electro‐fusion (FEBS Letters, 1982)](https://doi.org/10.1016/0014-5793%2882%2981012-0)\n14. [M. Glassy (1988). Creating hybridomas by electrofusion. Nature.](https://doi.org/10.1038/333579a0)\n15. [Substantially Improved Electrofusion Efficiency of Hybridoma Cells: Based on the Combination of Nanosecond and Microsecond Pulses (Bioengineering/MDPI)](https://www.mdpi.com/2306-5354/9/9/450)\n16. [Electrofusion of single cells in picoliter droplets (Scientific Reports, 2018)](https://www.nature.com/articles/s41598-018-21993-8)\n17. [Effect of Fusion Conditions on Efficiency of Electrofusion of Mouse Somatic Cell Nuclear Transfer (2009)](https://www.slarc.org.cn/dwyx/EN/Y2009/V29/I6/366)\n18. [Yaqi Bai and colleagues (2024). Microfluidic Chip for Cell Fusion and In Situ Separation of Fused Cells. Analytical Chemistry.](https://doi.org/10.1021/acs.analchem.4c04633)\n19. [Feasibility Study for the Use of Gene Electrotransfer and Cell Electrofusion as a Single-Step Technique for the Generation of Activated Cancer Cell Vaccines (Journal of Membrane Biology, 2024)](https://link.springer.com/article/10.1007/s00232-024-00320-5)\n20. [Spatially constrained encapsulation of cells in microdroplets enables continuous cell fusion within a microfluidic flow environment](https://kyushu-u.elsevierpure.com/en/publications/spatially-constrained-encapsulation-of-cells-in-microdroplets-ena/)\n21. [Microfluidic Control of Cell Pairing and Fusion](https://pmc.ncbi.nlm.nih.gov/articles/PMC3251011/)\n22. [mpikg.mpg.de](https://www.mpikg.mpg.de/th/people/dimova/publications/Riske%20BRL%2006.pdf)\n\n---\n*Topic: Encyclopedia › Life and health › Biological foundations › Cell biology › Membranes and trafficking*\n\n*Initially written Sep 29, 2026 · Edited: Oct 15, 2026; Oct 25, 2026*\n\n*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*\n\nLicense: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license\n", "same_as": [], "url": "https://www.edgepedia.org/electrofusion", "markdown_url": "https://www.edgepedia.org/electrofusion.md", "license": { "name": "Edgepedia Community License 1.0", "url": "https://www.edgepedia.org/edgepedia/license", "summary": "Free with credit, commercial use included. AI training is open to everyone. For other uses, organizations over USD 100M in revenue or 100M monthly users license separately.", "spdx": "LicenseRef-Edgepedia-Community-1.0" }, "credit": "\"Electrofusion\", Edgepedia (EdgeChat), https://www.edgepedia.org/electrofusion. Edgepedia Community License 1.0.", "credit_md": "\"[Electrofusion](https://www.edgepedia.org/electrofusion)\", Edgepedia (EdgeChat), [https://www.edgepedia.org/electrofusion](https://www.edgepedia.org/electrofusion). [Edgepedia Community License 1.0](https://www.edgepedia.org/edgepedia/license).", "credit_html": "\"Electrofusion\", Edgepedia (EdgeChat), https://www.edgepedia.org/electrofusion. Edgepedia Community License 1.0.", "speakable": "Electrofusion is a bench technique using short electric pulses to fuse adjacent cell membranes, producing hybrid cells for monoclonal antibodies, cancer vaccines, and diabetes research." }